From 764047cce019b1447b679fc6958523a4cc345b14 Mon Sep 17 00:00:00 2001
From: Jukka Aho <ahojukka5@gmail.com>
Date: Mon, 15 Dec 2025 06:32:29 +0200
Subject: [PATCH] test(basis): add test_interpolation test

Test file included in test/basis/runtests.jl
---
 test/basis/test_interpolation.jl | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 test/basis/test_interpolation.jl

diff --git a/test/basis/test_interpolation.jl b/test/basis/test_interpolation.jl
new file mode 100644
index 0000000..18d6c66
--- /dev/null
+++ b/test/basis/test_interpolation.jl
@@ -0,0 +1,30 @@
+# Test interpolation with basis functions
+using Test
+using StaticArrays, Tensors
+
+include("../../src/topology/api.jl")
+include("../../src/topology/segments.jl")
+include("../../src/topology/triangles.jl")
+include("../../src/topology/quadrilaterals.jl")
+include("../../src/topology/tetrahedra.jl")
+include("../../src/topology/hexahedra.jl")
+include("../../src/topology/pyramids.jl")
+include("../../src/topology/wedges.jl")
+include("../../src/basis/api.jl")
+include("../../src/basis/basis_generated.jl")
+
+@testset "Interpolation" begin
+    @testset "Seg2 linear" begin
+        values = SVector(1.0, 2.0)
+        N = get_basis_functions(Seg2(), Lagrange{1}(), Vec{1}((0.0,)))
+        result = dot(values, N)
+        @test result ≈ 1.5
+    end
+
+    @testset "Tri3 at node" begin
+        values = SVector(1.0, 2.0, 3.0)
+        N = get_basis_functions(Tri3(), Lagrange{1}(), Vec{2}((1.0, 0.0)))
+        result = dot(values, N)
+        @test result ≈ 2.0
+    end
+end